I'm thinking drivers as well, because the latest nvidia drivers don't crash at all when I run kombustor to test the GPU.
I did 3 tests that crashed without completing on the other 3 drivers I tried before the latest (beta 310.33)

Satisfied that it works in Kombustor, back to try them in GW2 again.... lol

Yeah, have done all stress tests I could find. Memory, CPU, GPU, even had the HDD on a monitor.

It just seems odd to me that the crashes change depending on what driver I use in GW2.

Ie if I use:
304.79 it's a black screen then no return of graphics.
310.33 3 flashes of black in a row then client crash
306.97 can run for a day and then a crash
296.10 frozen graphics and I have to restart
285.62 computer restarts itself

I'm on 306.23 atm and it actually hasn't crashed yet but I've only been testing for about an hour so far.

No other PC games have crashed at all GW2 doesn't even smash the GPU very hard either.